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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
Lease
term
Sep. 24, 2016
USD ($)
Contingent Consideration Earn-Out Payments [Line Items]      
Accrued expenses $ 375.3 $ 436.1  
Operating lease expiration year   2035  
Rent expense net of sublease income 19.3 $ 23.1 $ 17.9
Rent expense on sublease rentals $ 2.3 $ 2.6 $ 2.4
Finance Leases [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Number of finance leases | Lease   2  
Fair value   $ 28.3  
Finance lease expiration year   2024  
Accrued expenses   $ 1.6  
Accrued lease obligation-long-term   $ 34.7  
Optional lease extension period   10 years  
Number of optional lease extensions | term   2  
Lease extension period   5 years  
Finance Lease 2 [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Optional lease extension period   6 years  
Number of optional lease extensions | term   1  
Lease extension period   5 years  
Finance Leases [Member] | Leasehold Improvements [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Property, plant and equipment, estimated useful life   35 years